range of wireless networks

... 213 Index404 14 Economics of Wireless Networks 14.1 Introduction The field of mobile wireless communications is currently one of the fastest growing segments of the telecommunications industry. Wireless devices ... for wireless telecommunication companies. This chapter overviews several economic aspects of wireless networks, including economic benefits of wireless networks, facts that affect the economics of ... Changing Economics of the Wireless Industry The movement towards integration of wireless networks and the Internet has reached a point which marks a change for the business of the wireless industry....

Ngày tải lên: 29/09/2013, 21:20

... of these measures actually thwarts the overall goals of the wireless provider – to deliver cost- effective, always available, high quality services. Operations: The Custodians of Evolving Networks Wireless ... meeting the needs of Operations by designing and implementing the physical layer with a foundation of connectivity. Designing for Profitability in the Physical Layer of Wireless Networks Introduction Growth ... maintenance and troubleshooting of a steadily growing network infrastructure. Clearly, the physical layer of the wireless network is getting larger and more complex. With more wireless data services...

Ngày tải lên: 21/12/2013, 08:17

Ngày tải lên: 22/06/2014, 19:20

... Introduction 1.1 The Need for Third-Generation Wireless Technologies The first generation of wireless networks was primarily concerned with the provision of voice services, allowing users to transition ... One source of co- channel interference, de-correlated in time with 0 frequency offset. One source of adjacent channel interference, de-correlated in time with 200 kHz of frequency offset. One ... One source of co-channel interference, de-correlated in time with 0 frequency offset. One source of adjacent channel interference, de-correlated in time with 200 kHz of frequency offset. One...

Ngày tải lên: 26/04/2013, 11:15

Ngày tải lên: 18/10/2013, 12:15

... Performance analysis of wireless networks with directional antennas. IEEE Transactions on Vehicular Technology 57, 5 (2008), 3187–3199. 16 Eavesdropping range Indoor noise floor Outdoor noise floor Boosted range Amplified noise ... speeds of automobiles raise questions about the feasibility of eavesdropping. In this section, we experimentally evaluate the range of TPMS communications and further evaluate the feasi- bility of ... we studied the reception range of stand-alone sensors in a hallway. In the outdoor environment, we drove one of the authors’ cars around to measure the reception range of the sensors mounted in...

Ngày tải lên: 23/03/2014, 10:20

... security and are often used in security-related discussions, in the context of computer networks. The basic security needs of wireless ad hoc networks are more or less the same as those of wired networks. ... schemes of the wire-line networks have been developed and implemented in wireless cellular networks. To make ad hoc networks secure, we need to find ways to incorporate some of these schemes of wireless ... and quality of service in ad hoc wireless networks. Starting with a review of the basic principles of ad hoc wireless networking, coverage progresses to the vulnerabilities these networks face...

Ngày tải lên: 25/03/2014, 12:07

... Journal of Science, Mathematics - Physics 23 (2007) 55-62 55 Congestion control of Wavelet image compression over wireless networks Ho Anh Tuy 1 , Nguyen Vinh An 2,* 1 Hanoi University of ... Abstract. The demand of transmission of images and video is increasing quickly recently and researchers are trying to invest good solutions to improve the quality of these over wireless networks. There ... congestion control of ATM networks have been published. A survey is given in [5]. 3.2. Fuzzy logic implementation A wireless networks is a large distributed complex system with difficulty of highly...

Ngày tải lên: 28/03/2014, 13:20

... 2009. On the Lifetime of Wireless Sensor Networks • 5:39 SORO,S.AND HEINZELMAN, W. B. 2005. Prolonging the lifetime of wireless sensor networks via unequal clustering. In Proceedings of the 19th IEEE ... 2002b. Wireless sensor networks: A survey. Elsevier Comput. Netw. 38, 393–422. A RAMPATZIS, T., LYGEROS,J.,AND MANESIS, S. 2005. A survey of applications of wireless sensors and wireless sensor networks. ... International Conference on Wireless Networks (ICWN). C HIASSERINI , C F., C HLAMTAC , I., M ONTI,P., AND NUCCI, A. 2002. Energy efficient design of wireless ad hoc networks. In Proceedings of the 2nd IFIP...

Ngày tải lên: 28/04/2014, 13:38

... creation of structures appropriate to specific retrieval requirements in a range of contexts (Broughton, 2001). The emphasis is on the problems of complex subject description and representation of ... conferences 0 10 20 30 40 50 60 70 80 ICADL 1998 ICADL 1999 ICADL 2000 ICADL 2001 ICADL 2002 ICADL 2003 # of Papers # of Papers from Asia Figure 1. Number of papers accepted in ICADL ICADL 1998 ICADL 1999 ICADL 2000 ICADL 2001 ICADL 2002 # of Papers 23 18 37 34 54 # of Papers ... 14 26 25+ 31+ # of Countries 7 7 12 12 20 # of Countries from Asi a 6 5 7 9 12 # of Institutions 17+ 14+ 31+ 33+ 55+ # of Institutions from Asia 12+ 10+ 21+ 22+ 23+ # of Academic Departments/Discipline s...

Ngày tải lên: 01/06/2014, 00:46

... hoc wireless networks. The first part of this chapter presents the taxonomy of single-hop wireless technologies. Specifically, we introduce the concept of Body, Personal, and Local wireless networks, ... to as mobile ad hoc networks (MANETs) [33] or as infrastructure-less wireless networks. 1.2 Mobile Ad Hoc Networks A Mobile Ad hoc NETwork (MANET) is a system of wireless mobile nodes ... Hoc Wireless Networks Y u-Chee Tseng and Ting-Yu Lin 5 P erformance Analysis of Wireless Ad Hoc Networks A nurag Kumar and Aditya Karnik 6 C oding for the Wireless...

Ngày tải lên: 03/06/2014, 01:08

... 1 Department of Communications Technology, Faculty of Industrial Education, Helwan University, Helwan, Egypt 2 Department of Electronics and Electrical Communications, Faculty of Electronic ... h.kazemian@londonmet.ac.uk Abstract This article studies a vital issue in wireless communications, which is the transmission of audio signals over wireless networks. It presents a novel interleaver scheme for ... received audio signal. It improves the amount of the throughput over the wireless link through the packet loss reduction. Keywords: wireless networks; Bluetooth; fading channels; interleaving...

Ngày tải lên: 20/06/2014, 20:20

... D.) LetuslastnoticethatthechoiceforvaluesofM and J is a trad e-off between different aspects: cardinality of the resulting typical set (i.e., tractable number of points), number of simulation runs and accuracy of the histo- gram. ... interest of this model lies in the fact that it can be applied to a large range of values of the shadowing parameter. The proposed methods can also be easily extended to other types of networks. Keywords: ... a practical tool for the assessment and simulation of wireless cellular networks when the effect of shadow- ing is to be considered. The main contributions of this paper are as follows: • In the special...

Ngày tải lên: 21/06/2014, 00:20

... of packets to various applica- tions. In wireless networks, packets are transmitting with the presence of wireless links. When TCP operates in wireless networks, t he end-to-end performance of TCP ... thereby increase the perfor- mance of TCP over wireless networks. List of Abbreviations ACL: accuracy of congestion loss; ARL: accuracy of random loss; APR: accuracy of packet reordering; BS: buffer ... number of contention of nodes. Moreover, in wireless networks, the interferences between neighboring nodes are much higher compared to local area networks. As a result, the bit error rates of wireless...

Ngày tải lên: 21/06/2014, 02:20

... connection of length more than 6 hops. Moreover, node speeds have a minimal effect on the length of the TCP connection in terms of number of hops for RPGM because of the strict movements of nodes. ... certain range of the transmitting node cannot transmit. Two ranges are defined by the IEEE 802.11 MAC and are used in our simulation: the transmission range and the sensing range. The transmission range ... statistical analysis of the long-run node spatial distribution in mobile ad hoc networks, ” in Proceedings of the ACM International Workshop on Modeling, Analysis and Simulation of Wireless and Mobile Systems...

Ngày tải lên: 21/06/2014, 11:20

... (1), the scaling of G by a factor of 1/κ (or 1/θ η ) is equivalent to the scaling of node distance matrix D by a factor of θ and the scaling of self-interference gains g by a factor of 1/θ η . Therefore, ... receiver node of any link in the case of the tandem multihop wireless network (Figure 4)is smaller on average to that of the multihop wireless network (Figure 6) (Note that any receiver node of the ... the case of wireless CDMA networks the interference coefficient g ij (t) would model the residual interference at the output of despreading filter of node rec(j)[7]. Similarly, in the case wireless...

Ngày tải lên: 21/06/2014, 11:20

... static sensor networks. In this paper, we study data-centric storage in mobile wireless networks. To detect mobility of wireless nodes, [11] used received signal strength in wireless LAN to detect wireless ... Measurement of Accuracy of Neighborhood Prediction. One challenge of data-centric mobile wireless networks is the efficiency of data retrieval, which highly depends on the accuracy of neighborhood ... only deal with static wireless networks. However, with the increasing deployment of wireless devices, there are emerging pervasive applications that rely on the mobility of wireless device. Two representative...

Ngày tải lên: 21/06/2014, 18:20

Ngày tải lên: 21/06/2014, 20:20

Ngày tải lên: 21/06/2014, 22:20

Ngày tải lên: 21/06/2014, 23:20